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<div class="titlepage"><div><div><h3 class="title">
<a name="math_toolkit.float128.exp_function"></a><a class="link" href="exp_function.html" title="Exponential function">Exponential function</a>
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<p>
        There was a bug when using any quadmath <code class="computeroutput"><span class="identifier">expq</span></code>
        function on GCC : <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60349" target="_top">GCC
        bug #60349</a> caused by <a href="http://sourceforge.net/p/mingw-w64/bugs/368/" target="_top">mingw-64
        bug #368</a>.
      </p>
<p>
        To work round this defect, an alternative implementation of 128-bit exp was
        temporarily provided by <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">cstdfloat</span><span class="special">.</span><span class="identifier">hpp</span></code>.
      </p>
<p>
        The mingw bug was fixed at 2014-03-12 and GCC 6.1.1 now works as expected.
      </p>
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          It is essential to <span class="bold"><strong>link</strong></span> to the quadmath
          library, for example, in a b2/bjam file: <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">linkflags</span><span class="special">&gt;-</span><span class="identifier">lquadmath</span></code>
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